Valve tappet



Feb. 25, 1930.

W. G. CALKINS VALVE TAPPET Filed June 7, 1928 $79. 1. rII/IIIIIIIIIII IN V E NTOR WILL/A M G. CAL/(W5.

ATTORNEY Patented Feb. 25, 1930 UNITED S ATES PATENT OFFICE WILLIAM G. oALKINs, "F DETROIT, MICHIGAN, ASSIGNOB T0 CHRYSLER CORPORA- TION, 013 DETROIT, MICHIGAN, A ooRPoRArIoNoFZDELAwARE VALVE Application filed June 7,

This invention relates to a valve tappetand is illustrated as embodied in a valve tappet for use in internalcombustion engines.

In the manufacture of internal combustion engines it is desirable to rotate the valve tappet with respect to its operating cam so that the cam engaging face of the tappet is worn even and smooth. Heretofore the tappet hasbeen rotated by positioning the axis of the tappet out of line with the operating cam so that the cam will strike the engaging face at one side of its center thereby turning the tappet on its axis.

. An important objectiof this invention is to provide a means for rotating the tappet which is inexpensive and which may be used independent of the offset arrangement of the tappet with respect to the operating cam or used in conjunction therewith.

Another object of the invention is to rotate the valve tappet by the lubricant pressure, preferably by forcing the lubricant past a serrated portion of the tappet.

A further object of the invention in the 2 preferred embodiment of my invention is to arrange the serrations such that the lubricant pressure forces the tappet upwardly away from the operating cam and against the valve stem to take up the clearance usually left between the valve stem and the tappet.

Other objects and features of the invention including various desirable details of construction will be apparent from the following description of one illustratedembodiment shown in the accompanying drawings,

' in which line periphery 'rarrn'r 1928. Serial No. 283,6 74. 7 I,

Fig. 6' is a sideelevation of atappet show ing spiral serrations. Fig. 7 aside elevation ofza. tappet in which tapered serrations are provided in the outer periphery thereof, a portion of theltappet being broken away and'shown in section. Fig. 8 is a sectional view through a tappet showing amodified form of the serrations which may be used with any one'of theforms showninFigs.4,6and7. V R ferringto the illustrated embodiment of'my' invention, a 'valve operating mechanismis shown in Fig. 1 including'a'camshaft 10, valve tappet guides 12 and valve tappets 14.1" The valve tappet guides'are shown formed-in a single member 16 whichiis bolted to th'side 'of-t'he cylinder block by bolts 18. A longitudinal passage '20 is" formed inthe member 16 and'its inner wall intersects with each of the openings for the valve tappet's the-guides 12 so that when the valve tappets are in position a portion of their outer-peripheryextends into the passage 20 as shown in Fig. 2. Connections 22 and 24' are shown at the opposite ends ofthe passage, one con nection 22 to admit a lubricant under-pressure to the-passage and the other 24 toconduct the lubricant to the various parts'jof the 7 engine to be lubricated. Thus "it'will ber'ap parent that lubricant under'pressure continuallyfiows throughthe' passage 20in engagement with a portion of the valve tappet stem. The camshaft is journaled in a bearing 26' and is provided with cams 28 adapted to reciproc'ate the tappet for lifting orclosin'g the valves 30. The camshaft-may be driven in theusual manner; 7 On the outer periphery of the valve tappet stem I-have provided aplur'ality ofjserrations 32;" In Figs. 3'and ithe serrations have been shown as vertical grooves. The-lubricant is received in thesefgrooves and as it flows through the passage 20, and the tappet is carried with the lubricant and rotated thereby.

In the form of my device shown in Fig. 6 the serrations I have been shown in Y the form of spiral grooves 34. As thelubricant flows past these groovesthe pressure is directed up- Wardlyforcing the tappet. upwardly against the lower end of the Valve stem. In the form shown in Fig. 7 the serrations 36 are Wedge shaped With the large end of each serration' deeper at the top than at the bottom. This form also provides a means lifting the tappet by the lubricant pressure.

If desired theserrations in any of theiforms shown may be formed as shown in Fig. 8. The one side of the serrations next'to the inlet sideofthedubricant portlmay be tapered from the outerperiphe'r'y ofthetapp'et to the bottom of the groove as indicated by the numeral 38. The other side of the Wall is formed radial as at 40130 ,ionm a shoulder against which the lubricant under ressure f rce the t ppe in, an ang lar d re t It Will beunderstood thatvarious changes udin i andarra g m tp s m y b m elw thou depar i g r m h v p ri o y nr t qn nd i is no my n e i t im it s ope Qthe ithanhythe erm oi th ppend d laims- 1Q tappet of the class described comprising a stem portion and ac am engaging poron,lmean mfq llu r ew g he fiempo i and means on the periphery oi said stem for at ng.th t ppe by; he l b iw tpres u onthe am r r .tappe of th I las des b d mp singi estem P ti n r a en n po tiqnumea-n i o fl wi gl qu d t e t m P o and-mea s nt-th Periph ry J Said st m adaptedi eurg esa di appe inward y ian ul r y by ;t e a ow o l quid-la de pres ur pas th perip ery o sa -stem A constru t o 1 t clas d r be mpr i in teqmbinati n, a pl r ity alv em p t ar an e 5 l nmen and a h Prov ded wi h;s rratio si tth rp rip ra of th'eirfs emea s ppor ha ngeere n to re e rezthewh nt ppet-stemsy n a lubr 9ampa sa in aid epp r i c mmuni a i withth open n s-i sa -summ- A n t qtiqn f th c as d sc ibe ompr sin in c m na i n, va v t -pre ui es, val e appe n sai guid sa lubr cant passage adjacent said tappets, a portion o h PQlT PhQ Y o z a dt ppet :ext nd g nto-S dpa sageiandmean n h pe n y said;tappetsadepte mh s e t s q angu a mov m t byth ifiewpfile iqa tt r said passage. 7

;.5- VA c qn mm io o $11. zelas des rib comprising, v eombination, valve gtappet uid s,- va r tapp s i gu de w lu cantpassage 'ad a ent said tappets and communicating itha portion ofthe periphery of said tappets and means onthe periphery of said-tappets, adapted to urge-said'tapp'ets upward-lyra'nd-angularly bythe flowof lubricant under pressure past the -peripher y of said t pp a 16-;A const u ti n the. class described awry-r ng ra paging g h vi 'ng ia :lub iqating #WIIBLIAMIG. CALKINS.

construction of the class described 

